2,289 research outputs found
Survey on Photo-Voltaic Powered Interleaved Converter System
Renewable energy is the best solution to meet the growing demand for energy in the country. The solar energy is considered as the most promising energy by the researchers due to its abundant availability, eco-friendly nature, long lasting nature, wide range of application and above all it is a maintenance free system. The energy absorbed by the earth can satisfy 15000 times of today’s total energy demand and its hundred times more than that our conventional energy like coal and other fossil fuels. Though, there are overwhelming advantages in solar energy, It has few drawbacks as well such as its low conversion ratio, inconsistent supply of energy due to variation in the sun light, less efficiency due to ripples in the converter, time dependent and, above all, high capitation cost. These aforementioned flaws have been addressed by the researchers in order to extract maximum energy and attain hundred percentage benefits of this heavenly resource. So, this chapter presents a comprehensive investigation based on photo voltaic (PV) system requirements with the following constraints such as system efficiency, system gain, dynamic response, switching losses are investigated. The overview exhibits and identifies the requirements of a best PV power generation system
A novel modified sine-cosine optimized MPPT algorithm for grid integrated PV system under real operating conditions
This research work presents a modified sine-cosine optimized maximum power point tracking (MPPT) algorithm for grid integration. The developed algorithm provides the maximum power extraction from a photovoltaic (PV) panel and simplified implementation with a benefit of high convergence velocity. Moreover, the performance and ability of the modified sine-cosine optimized (MSCO) algorithm is equated with recent particle swarm optimization and artificial bee colony algorithms for comparative observation. Practical responses is analyzed under steady state, dynamic, and partial shading conditions by using dSPACE real controlling board laboratory scale hardware implementation. The MSCO-based MPPT algorithm always shows fast convergence rate, easy implementation, less computational burden and the accuracy to track the optimal PV power under varying weather conditions. The experimental results provided in this paper clearly show the validation of the proposed algorithm
Traction and charging systems for an electric motorcycle
Dissertação de mestrado integrado em Engenharia Eletrónica Industrial e Computadores (área de especialização em Electrotecnia e Sistemas de Energia)With the current mobility paradigm, it is proven that excessive energy consumption and low energy
efficiency are harming the planet and deteriorating human life conditions. Therefore it is required to
substitute Internal Combustion Engines (ICEs) for electric motors and consequently shift gradually to fully
electric vehicle (EV) fleets. The electrification of mobility is one of the most researched topics in all technology
fields. These efforts put society closer to achieve energy sustainability and reduce the negative human
impact on the environment. With this, low energy consumption vehicles such as electric motorcycles (EMs)
are a very viable solution to reduce energy consumption. Due to their low power and weight, EMs have
high energy efficiency and are optimized for urban transit. In this context, it becomes necessary to develop
systems and prototypes common to any EV. Therefore the focus of this thesis is to implement motor traction
and battery charging systems for an EM.
One of the most important characteristics of an electric traction system is the possibility of applying
regenerative braking. Regenerative braking converts the mechanical energy, otherwise dissipated by
conventional brakes, into reusable energy that is sent back to the batteries. This process occurs due to
the operation of the traction system’s power converter and improves greatly the energy efficiency of the
EV. Besides, is proposed that the traction system’s input is a hand accelerator that can control the motor
speed/torque.
The charging system acts as an interface between the power grid and the motorcycle system. In
applications such as EV charging, it is important to ensure power quality in order to maintain the developed
system and the power grid healthy. With this, the first stage of the charger is AC-DC rectification and besides
regulating the DC-link voltage should also act as a Power Factor Corrector (PFC) and compensate current
harmonics. Secondly, the charger system should be able to regulate and control the charging process
by maintaining a constant current, voltage, or temperature. The charger should also ensure the battery’s
safety, and offer the possibility of regulating the charging speed.
This document, details the development of traction and charger systems from the state of the art
research and topologies presentation, to the computational simulations, and respective experimental
tests/validation.Com o paradigma da mobilidade é evidente que o consumo excessivo de energia proveniente de
combustíveis fosseis está a prejudicar o planeta. Por conseguinte, é necessário substituir os Motores de
Combustão Interna (MCI) por motores eléctricos e, consequentemente, transitar gradualmente para frotas
de veículos 100% elétricos (VE). A eletrificação da mobilidade é um dos tópicos com mais investimento
em investigação de todos os campos tecnológicos. Estes esforços aproximam a sociedade para alcançar a
sustentabilidade energética e reduzir o impacto humano no ambiente através da extração de combustíveis
fósseis. Com isto, veículos de baixo consumo energético, tais como motociclos eléctricos (ME), são uma
solução muito viável. Devido à sua baixa potência e peso, os MEs possuem elevada eficiência energética
e são optimizados para o trânsito urbano.. Neste contexto, torna-se necessário o desenvolvimento de
sistemas e protótipos comuns a qualquer EV. Portanto, o foco desta dissertação é a implementação dos
sistemas de tração para um motor e de carregamento de baterias para um ME.
Uma das características mais importantes de um sistema de tracção elétrica é a possibilidade de aplicar
travagem regenerativa. A travagem regenerativa converte a energia mecânica, de outro modo dissipada
pelos travões convencionais, em energia reutilizável que é reenviada para as baterias. Este processo ocorre
devido ao funcionamento do conversor do sistema de tracção e aumenta a eficiência energética do VE.
Além disso, é proposto que o sistema de tracção seja controlado através de um acelerador manual que
pode controlar a velocidade/torque do motor.
O sistema de carregamento actua como interface entre a rede elétrica e o motociclo. Em aplicações
como o carregamento de VEs, é importante assegurar a qualidade da energia tanto do sistema desenvolvido
como da rede de elétrica. Com isto, a primeira fase do carregador, para além de regular a tensão DC, deve
também actuar como corrector do factor de potência (PFC). Em segundo lugar, o sistema carregador
deve ser capaz de regular e controlar o processo de carregamento mantendo uma corrente, tensão ou
temperatura constantes. O carregador, para além de fazer a interface entre o DC-link e a bateria, deve
oferecer a possibilidade de regular a taxa de carregamento.
Este documento, detalha o desenvolvimento de sistemas de tracção e carregamento desde a
investigação e apresentação das topologias mais utilizadas, até às simulações computacionais, e
respectivos testes experimentais/validação
Advanced and Innovative Optimization Techniques in Controllers: A Comprehensive Review
New commercial power electronic controllers come to the market almost every day to help improve electronic circuit and system performance and efficiency. In DC–DC switching-mode converters, a simple and elegant hysteretic controller is used to regulate the basic buck, boost and buck–boost converters under slightly different configurations. In AC–DC converters, the input current shaping for power factor correction posts a constraint. But, several brilliant commercial controllers are demonstrated for boost and fly back converters to achieve almost perfect power factor correction. In this paper a comprehensive review of the various advanced optimization techniques used in power electronic controllers is presented
Design and Control of Power Converters 2019
In this book, 20 papers focused on different fields of power electronics are gathered. Approximately half of the papers are focused on different control issues and techniques, ranging from the computer-aided design of digital compensators to more specific approaches such as fuzzy or sliding control techniques. The rest of the papers are focused on the design of novel topologies. The fields in which these controls and topologies are applied are varied: MMCs, photovoltaic systems, supercapacitors and traction systems, LEDs, wireless power transfer, etc
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